Facilities generating coherent X-rays tend to be large scale and costly. Now researchers have demonstrated a parametric and coherent laboratory-scale X-ray source by passing moderately energetic electrons through van der Waals heterostructures.
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The author declares no competing interests.
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Uschmann, I. A free-electron laboratory coherent X-ray source. Nat. Photonics 14, 655–656 (2020). https://doi.org/10.1038/s41566-020-00710-w